642220611 has 16 divisors (see below), whose sum is σ = 908112384. Its totient is φ = 402318464.

The previous prime is 642220603. The next prime is 642220613. The reversal of 642220611 is 116022246.

It is not a de Polignac number, because 642220611 - 2³ = 642220603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642220613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23266 + ... + 42728.

It is an arithmetic number, because the mean of its divisors is an integer number (56757024).

Almost surely, 2^642220611 is an apocalyptic number.

642220611 is a deficient number, since it is larger than the sum of its proper divisors (265891773).

642220611 is a wasteful number, since it uses less digits than its factorization.

642220611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 642220611 is about 25342.0719555446. The cubic root of 642220611 is about 862.7694257635.

Adding to 642220611 its reverse (116022246), we get a palindrome (758242857).

The spelling of 642220611 in words is "six hundred forty-two million, two hundred twenty thousand, six hundred eleven".